var PennerEasing = {
linear: {
easenone: function(t, b, c, d) {
return c * t / d + b;
},
easein: function(t, b, c, d) {
return c * t / d + b;
},
easeout: function(t, b, c, d) {
return c * t / d + b;
},
easeinout: function(t, b, c, d) {
return c * t / d + b;
}
},
quint: {
easeout: function (t, b, c, d) {
return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
},
easein: function(t, b, c, d) {
return c * (t /= d) * t * t * t * t + b;
},
easeinout: function(t, b, c, d) {
return ((t /= d / 2) < 1) ? c / 2 * t * t * t * t * t + b : c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
}
},
quad: {
easein: function (t, b, c, d) {
return c * (t /= d) * t + b;
},
easeout: function (t, b, c, d) {
return -c * (t /= d) * (t - 2) + b;
},
easeinout: function (t, b, c, d) {
return ((t /= d / 2) < 1) ? c / 2 * t * t + b : -c / 2 * ((--t) * (t - 2) - 1) + b;
}
},
quart: {
easein: function(t, b, c, d) {
return c * (t /= d) * t * t * t + b;
},
easeout: function(t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
},
easeinout: function(t, b, c, d) {
return ((t /= d / 2) < 1) ? c / 2 * t * t * t * t + b : -c / 2 * ((t -= 2) * t * t * t - 2) + b;
}
},
cubic: {
easein: function(t, b, c, d) {
return c * (t /= d) * t * t + b;
},
easeout: function(t, b, c, d) {
return c * ((t = t / d - 1) * t * t + 1) + b;
},
easeinout: function(t, b, c, d) {
return ((t /= d / 2) < 1) ? c / 2 * t * t * t + b : c / 2 * ((t -= 2) * t * t + 2) + b;
}
},
circ: {
easein: function(t, b, c, d) {
return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
},
easeout: function(t, b, c, d) {
return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
},
easeinout: function(t, b, c, d) {
return ((t /= d / 2) < 1) ? -c / 2 * (Math.sqrt(1 - t * t) - 1) + b : c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
}
},
sine: {
easein: function(t, b, c, d) {
return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
},
easeout: function(t, b, c, d) {
return c * Math.sin(t / d * (Math.PI / 2)) + b;
},
easeinout: function(t, b, c, d) {
return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
}
},
expo: {
easein: function(t, b, c, d) {
return (t === 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
},
easeout: function(t, b, c, d) {
return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
},
easeinout: function(t, b, c, d) {
if(t === 0) return b;
if(t === d) return b + c;
if((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
}
}
};